| General > General Technical Chat |
| Passive summer/mixer to combine a differential speaker-level signal and a single |
| << < (3/3) |
| BrianHG:
(This should have been posted in the 'Beginners' section as it may have gotten more views) Is no-one here going to correct this guy's erroneous schematic use of a transformer to convert a balanced floating source to a unbalanced output for mixing AND solve the unfiltered class D output of the PAM8302 which may be ok to directly feed a small speaker but will make havoc driving a line level input's with those high frequency square waves. (Ignore this second part if the user's PAM8302's output already goes through a choke inductor.) |
| NiHaoMike:
--- Quote from: themadhippy on December 09, 2023, 07:49:22 pm ---its nothing to do with sound quality,its about not destroying the output stage of the pam 8302 .If you look at the functional diagram you see each of the outputs (vo+ and vo-) can be pulled to either positive or ground, if you ground output vo2 ,whats going to happen when its being pulled positive? even if it dont get upset ,at the same time v+ will also be at ground and the resulting signal will be ? --- End quote --- Leave the other end unconnected. |
| MarkT:
--- Quote from: kubark42 on December 07, 2023, 01:47:59 am ---For the input to a mono amplifier, I would like to mix together a differential signal coming from a PAM8302 (differential amplifier, 2.5W to 4 Ohm load) with a single-ended line level signal. --- End quote --- The PAM8302 is a filterless class-D amplifier so definitely cannot be mixed as an audio signal as its bandwidth is well beyond audio. You could mix the signal going into the PAM8302 with the other signal though. |
| Navigation |
| Message Index |
| Previous page |